From what I see nothing is wrong with either tree. The leaves are growing in the manner of indoor trees. As to the difference between the two trees, it is the same as children born from the same two parents. Some children are taller, some are stronger, some have bigger feet. Looks like your a good mother to both trees, They are blessed having someone who cares and is taking care of them.

Nice babies

citrus genetics vary from plant to plant

Both look nice, especially if they are grown indoors. Just keep an eye for spider mites and pests. I would wash the leaves off once a month with water especially under the leaves. You could rinse those trees under a hose too, preventative measures I call it, just in case.

I will try