Is there much difference between the 54 UN55? I thought one was ENG and was was ITA thread but I could be wrong?

I had to find a JIS BB with ~110mm spindle (OK crank calls for 110.5) in Italian threading. My options were pretty limited once price was factored in. I went with the UN55 and it paired my 73 Bianchi with a new FSA Gimondi crank just fine but I do wonder about the chainline being exactly strait. I know, 99 problems.