Can I use a NEW but NON CIRKUS subplatter with a NEW Cirkus bearing ?

I am tweaking my Linn and I have an old (non Cirkus) type subplatter (spare).  It is old style but never used.  So its spindle is pristine and not worn off.

When I look online, the Cirkus upgrade kit is about $600.  This is too expensive.  However, I can find the shaft of the Cirkus (the black part with the thrust plate) brand new for about $100.

So, if I can use my old subplatter with the new bearing, would the dimensions fit ?

I know I may also have to upgrade my subchassis too but I am doing this incrementally so it will take time.

Thanks