としても・たところで・にせよ・にしろ: the difference
としてもN2
Meaning
Even if
Past papers
Tested 5 times in past papers
Example
たとえできるとしても、やらないだろう。
I wouldn't do it even if I could.
たところでN1
Meaning
Even if ~ cannot or will not, Even though ~ not
Past papers
Tested once in past papers
Example
徹夜で勉強したところで、合格しない。
Even if I studied all night, I would not pass.
にせよ・にしろN2
Meaning
Even if, Even though, No matter
Past papers
Tested once in past papers
Example
違いがあるにせよ、わずかな差だ。
Even if there is a difference, it is minimal.
How to tell them apart
「にせよ／にしろ」: after granting the first part, the proper attitude or judgment stays the same; the result can be advice, a claim or a duty.
「としても」: a purely hypothetical concession; stronger sense of supposition.
「たところで」: the result is always futile, 'it won't help even if you do'.