I've tried our Para 88 with a B2 - it's sub optimal to say the least. Due to the recessed tube, you need to add app. a 6" extender onto the para's lamp pin to get the light further out to fully flood the para. With a Bx/Dx, you'd be placing a metric $%^ton of weight pretty far out on that rod when extended to full 'flood' . It can be done, but I'd never advocate it.
The other issue with a recessed head is the inherent 'focused' nature it gives the light at any setting given the 70 deg light spread vs. 180 deg of an old style Profoto (or Bron). With a classic head, you can modify the spread with cinefoil, but a B2 cant take a dome and the Bx/Dx domes only approximate the 180deg spread of a classic head. Still not great for large modifiers.
We had a bunch of B1s, D1s and a B2 along with Acute kits until we sold all our recessed tube units to standardize on AcuteBs and ProB2s (and a couple of older Compacts). The recessed units weren't great for some uses (such as the Para, BDs and large boxes) and the eclectic mix of lights made juggling lights vs. modifiers for any given shoot a PITA. A (now) cheaper-than-chips old Acute 1200/2400, AcuteB kit or 7B / ProB2 unit is a perfect fit for the para w/o undue weight and handling issues from front-heavy handling with modest cost.
The only downside to an classic (or any) Profoto lamp in a Para is there's no ability to mount the head from the rear (like in a deep octa) as the Bron mount is too narrow a diameter to take any DIY adapter.