1. Those actually look pretty similar to me. The only differences I can see are:
a: more elongated snout
b: no extra toe on the back foot
c: slight difference in sails
Those are really small differences, and you're forgetting one key detail here:
IT'S BLOCKLAND.
This is what a horse looks like in Blockland.
Do you want a high-res 100% accurate model of a dinosaur in Blockland? Would that fit at all?
Edit: Also, please don't forget the Dilophosaurus with the acid spitting (even though it didn't do that IRL, it would be awesome and accurate to the movies.)