I have tin type Clutch and Brake master cylinders for my 850 and the length of the push rods are approx 2-3mm different from the clevis pin hole to the domed end. The clutch and brake pedals end up different heights. Is there different lengths and if so can some tell the correct length.

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I see that you don't have any replies to your question that should at least have some acknowledgement, as these questions sometimes open up a 'rabbit hole'.

There will be others who know far more than me. My mini K has 2 tin tanks and the brake pedal is slightly higher than the clutch pedal by 7-8mm. Cooper S have a more obvious height difference but they also had a different brake pedal angle.
I don't know if there were different pushrod lengths (other than badly worn clevis pin holes?). The critical thing is to make sure that when the pedals are at rest, there is clearance between the pedal and the open box section where the pedals connect to the m/c pushrods. The ensures the internal piston returns to the 'off' position.

I will often swap over the push rod from the old one to the new one if its longer and the same other than the length

If that's not possible I cut and weld the rod and add 6mm to increase the length which brings it close enough to the original push rod length from the 60's

Hope this helps