The exhaust wheel is larger, whilst the trim is smaller - trim being such a small difference while the wheel is larger - should flow more, but it's hard to say.
They should be very responsive in a .48 housing but will most certainly fall over given -9s fall over by 7500rpm with their housing/turbine/compressor combination.
At a stab maybe all over by 6500, 7000 at a stretch.
Given the rear housing is smaller & larger comp wheel, it'll be interesting to see if there might even be issues with surge as positive pressure is attained in higher gears/low RPM. Similar to what a Garrett -10 but earlier given the size differences and would probably go away a lot easier.
Honestly I wouldn't waste time, it's all quite a bit of guess work and if it doesn't work - what do you do then? Spend more labour to get them out and swap?
Probably why they were for sale in the first place.