Do the early B21F engines use the same temp sensor as the B20?

Susan's 245 had some kind of aftermarket bulb type temp gauge with an
armored tube (about 3 feet too much of it) going through the firewall
to a small dial on the dash. When I tried to disconnect it the tubular
fitting that holds the bulb into the fitting installed on the head crumbled
sort of like shale. There was enough tube that I could still unscrew the
fitting out of the head. Since the device was nonfunctional before, she
really didn't have a valid temp gauge. I remember some of you telling me
that the unused yellow wire went to the OEM temp gauge so I tried a B20
temp sender in the hole in the head and it fit like it belonged there.
If I hook up the yellow wire should it work OK?

Thanks for your advice!
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George Downs, Bartlesville, Oklahoma, Central US