OK, I got a chance to work on it today. If I do this right the attachments will be in order.
I set the kub mount on my Massey, first problem was that the bearing mounts for the blower drive shaft hit the steering.

I initially tried to move the hitch forward to clear the steering, which caused the other bearing to hit the axle.

So that wasn't going to work, My next idea was to notch my front frame, where the hitch tightening wedge bolts are, to allow the hitch to sit lower and clear the axle and steering, when contacting the front tractor frame properly. This also allows the hitch to sit on the top ledge, rather than on the 2 bolts. And the bearings now clear. I lost about 5/8" ground clearance.
This pic is the front top of the Massey frame. The hose is in the way but there's a T handle on that bolt, which can seen in the last pic.

So now the issue is to secure the lower part of the hitch. On the Kub there's 2 pins that slide through the hitch and tractor frame. None of the Massey holes line up with those 2 holes, so I'm going to make a couple plates that will bolt into the Kub hitch holes but extend up to the Massey frame holes. I should be able to slide a long bar through there, keeping install and removal of the hitch fairly quick.

I see 2 more issues, 1 is that due to the height of the hydraulic cylinder mount, the hood will only open about halfway, enough to get jumper cables on it if needed, and 2, the hydraulic quick connect fittings will need changed. The Massey ones are bigger.
I think I can "modify" the cylinder mount by cutting it loose and angling it forward, which should give me more room to open the hood.

I will need to get a mid mount snowblower drive shaft, my mower shaft is too short. The Kub part number says the shaft should be 37.25" long, and that's the measurement I get.
I hope that the spline count and size on the Massey pto is the same as the Kub.