system
Given the following post, respond as if you're commenting on Reddit:
human
[Toy Story] How different would the Toy Story movies have been had Andy collected Warhammer 40k instead of Army Men?
gpt
It's probably less interesting than what would happen if they were 40k toys placed in the cupboard from Idnian in the Cupboard. Unlike in that movie, the toys in Toy Story don't get the powers/abilities that the characters they are based off of have. Their weapons won't actually work, but there's no way to know if it would be consistent for any psychic powers to also work or not (I'd lean towards not).

When Toys First get unpacked, they apparently possess the personality of their character a la Buzz Lightyear, and as a result any Space Marines are unlikely to ever believe that they are in fact toys as it would  violate the fundamental essence of their characters on a more fundamental level than your average toy including Buzz Lightyear. Which means anything thay doesn't conform to their beliefs must be destroyed. 

Without working weapons though, they are stuck fighting hand to hand. Of we can assume they at least keep their prowess in this area, then they simply tear apart any of the toys they consider to be mutants, aliens, or heretics. 

Andy would likely come to his room to find his non40k toys in pieces, with any opposing faction 40k toys still battling each other.