Personally I don't think it would look good mixing and matching different style lights inner vs. outer. Especially since both versions of E70 used "CELIS" style light bars, either the 4 bar or 2 bar style - the E53 outer doesn't have these, so they would just sort of awkwardly terminate at the outer E53 light.

E70 also put the reverse light in the outer, E53 had it in the inner - so even if they physically fit (which I also doubt) then you'd have to figure something out for the reverse lights.