The lifters may be the same, but since the B2600i is a 12 valve engine, the geometry of the rocker arms is different. The lifter end is offset from the cam lobe because the valves are in the "corners" of the combustion chamber. The rockers on the B2000/B2200 are a straight shot. Only the the B2000 uses a mechanical lifter anyway. But due to the geometry, it wouldn't fit.
See the offset on this B2600i head?
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And here is a mechanical lifter from a B2000 (from another thread on this site.)