[cobirds] Birding Camera Optics Question

Need assistance understanding pixel pitch effect on resolution.
Due to life changes, I am now birding using my camera at the limits of its abilities.

My Nikon D7200 plus 300mm zoom lens is aging, and I want to replace it with a Z 6 iii mirrorless with 200mm zoom plus 2x telextender. The D7200 has 3.89 µm pixel pitch, the Z 6 iii has 5.92 µm. Am I correct that, all things being equal, this means worse resolution at the same distance?
I had been thinking that better image stabilization, larger sensor, and newer electronics would be an advantage, then it occurred to me to check the pixel pitch. I really don't want to spend thousands of dollars to make my remaining birding years worse. Any advice greatly appreciated.
The picture attached (I'm thinking red tailed hawk) is taken at the limit of my D7200 rig.)  I hope this image clarifies my dilemma. Image taken in North Boulder CO on 2 24 2026.

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