ericson 35 repower

I need to replace the universal M25-XPB engine in my 1988 Ericson 35 Mark III. I have read an old post that the Kubota D-950 is the same engine. Has anyone actually done this?? A new M25_XPB engine, transmission runs $10,000 in New Jersey or $8600 out of Virginia plus labor to put it in. I...