The LEGO Saturn V was originally released as a LEGO Ideas set 92176 between June 2017 and December 2019; but it was re-released as set 21306 just 1 year later.

So what's the difference between the two sets? A single brick. In the 306th step, during the mini Lunar Lander build, a 2x4 dark grey flat brick now has Technic holes in it to help the stability and placement of the Lunar Lander on to the stand.

The LEGO Death Star 10188 was available between September 2008 and December 2015, which is a long time for any LEGO set to be available at retail and it was expected that after it's retirement the resale price of the set started to increase rapidly as with most large LEGO Star Wars sets.

However, LEGO had other plans re-releasing the set as the 75159 Death Star with 200 extra pieces. Some were used for the additional TIE Advanced fighter, there were 3 new minifigures (and a change to the existing figures) and a few structural changes were made.

So #75159 was better? Well, there was a huge caveat to that. When adding 200 pieces, LEGO also took the opportunity to hike up the price making the price per brick go up to 12.4 cents or 10.2p, from 10.5 cents or 7.2p in the original.

The price difference has continued in resale value since #75159 retired - so it's up to you whether you think the changes are worth it.

The LEGO Fiat 500 was originally released as set 10271 in yellow; but it was re-released in a limited edition blue as set 77942.

Other than colour, there is also some differences with the sticker sheet such as the painting of the car being changed to match the set colour and the addition of a Union Jack sticker for the suitcase.

Which one is right for you depends on your favoured colour, but know the 77942 blue one won't be around for much longer.

Originally on sale in 2008, the 10256 LEGO Taj Mahal was eventually re-released in 2017 as 10189 with its piece count increased by a single brick - used for a brick separator.

However, there were a few other changes too. The instructions were changed to introduce more steps so the set was easier to follow and numbered bags were introduced. Finally, some of the bluish grey pieces were updated to dark tan color.

Another popular set from the LEGO Ideas range, the LEGO Ship in a Bottle originally launched in February 2018 as set 21313 and was on sale for around 2 years.

After a years' break, it was back on sale as set 92177.

Despite an initial error with the piece count on the front of the box, there was no difference between the two sets.

Although if you're looking for a set now, you may prefer to look for set 21313 as 2018 was also the year where LEGO had an issue with brittle red-brown bricks like those used for the ships' masts.

The LEGO City Fire Station Headquarters was originally released as set 60110 in January 2016 - December 2018; but it was released in September 2021 in the UK only as set 77944 with some cosmetic changes.

Firstly, some more bricks had been introduced to improve the size of the helipad structure; and secondly some minifigures were changed.

This was part of a trial from LEGO where they were used for consumer testing.

The original LEGO Winter Toy Shop released in October 2009 and stuck around until January 2012 by which time it seemed quite dated.

In Octonber 2015, LEGO decided to re-release the set with more modern LEGO elements such as the Christmas reefs and they updated the minifigure prints too whilst bumping the count up from 7 to 8.

The LEGO Creator 3-in-1 Mighty Dinosaur has been re-released not once but twice. The difference? The colour of the dinosaurs.

31058 is green. 77940 is brown. 77941 is blue.

If you click through to the LEGO store from our link below and you're in a qualifying region, you can select your colour directly on the site.