Is there any difference between the meaning of make up to someone and make it up to someone?
"Make up to someone" isn't used in the UK. If you have had an argument with someone and there is bad feeling between the two of you, you might decide to "Make it up with them".
On the other hand, if you have done something to cause them some form of loss, then you might decide to "make it up to them" by putting wrong the right.
"My friend and I argued, but I have since made up with him."
"I broke my friend's vase, but I have made it up to him by buying him a new one"
It's possible that the act of "making something up to someone" has the side-effect of "making it up with someone" if the person is angry with you for some loss you have caused them.