Sorry to keep you guys waiting, finally have the chance to do it. See below.
Cant show in full res but it should be good enough to see the diference. Version A
: This was the original file rendered from V1.71.Version B
: This was the exact scene from V1.71 and rendered in V2.0 with the same multilight settings from V1.71.Version C
: So i adjusted the multilight in V2.0 so that it has almost the same intensity as the one in V1.71, but textures are still out.
Of course this will have not impact on any new projects but if clients going to come back with
changes and new render on the past projects, then i have to fall back to 1.71 again.