There are minor differences between the older 416T and 416P48 capsule and associated parts , the modern capsule is interchangeable with modification of the equalisation components on the older T powered version , there is a section in the MKH service documents about this ,
My guess is both mics perform substantially the same .
Below is the schematic for the convertor board Mr Clunk kindly sent me ,
I have the parts ,but didnt put it together yet ,
I might just assemble it into an XLR barrel jack rather than trying to fit the pcb into the mic body ,
My 416T is the XLR version .
View attachment 123757