I doubt the MT PSU will fit in the SFF chassis. Even so, you won't need to, since such a system will never really draw more than 200W (~100W for the CPU, ~75W for the GPU). That being said, you will want to check if the SFF's motherboard has a weird power limit on the PCIe slot, such as my old HP Compaq Pro 6300 SFF which had a 25W limit on its PCIe slot, also with a 240W PSU. A GTX 1650 can't run well on 25-35W.Hi
The motherboard in MT doesn't work and I needed a SFF for space but it does have a working 300w Psu. My plan is to put in a 1650gtx which will be fine for my needs. But on a 240w I wouldn't risk it.
I ran a low profile GT 1030 on a 25W PCIe slot in an SFF HP Compaq 6300. It worked fine for the year or two I had it. It should work for you as well, and is a lot better than a 610I looked around and I could be in luck. On an intel forum someone said the GT610 was compatible.