Victor and the Veil

Does Victor's advice to Walton change by the end of the novel?

I don't think so. It's just that the motivations and circumstances for the intial advice are explained and thus, seem less callous.

Does Latimer resemble Victor?

Resemble? Absolutely. Their obsessive personalities and general hubris are easy to parallel. The choose their goals and pursue them despite the consqeuences and, rather than view them as such - consequences that is - , they regard the effects as the problem of society and "fixable" once they change things. The reality hits them like a break and, boo hoo, they are merely mortal.