Nope I would say it is most likely the same kitten. The first pic I would say is actually a DLH just an older kitten. The ear fluff looks pretty long to me and has thicker fur on the chest. The pic is pretty bad though which is why its hard to tell.
For comparison, this was fynn at 6 weeks old, 5 months old and at 3 years old. He has a huge mane now but it took a while to get it (around 2ish lol but he didnt stop growing until 3 years old). His mane and belly fur are long, his legs are short and tail is puffy. I have 2 other longhair cats that are completely different in fur lengths to. Not all floofers are the same but the one thing they have in common is when they are young they aren't so fluffy lol Jetty was even shorter in fur length and though he doesnt have his brother's mane his tail fur and body fur are longer.