Well a great many things are possible, but most don't make sense to do. Unless you know the history of the engine build, you never know what might have been done.
1) It is possible that someone took a 428 flywheel and neutral balance it. Hang it on a low friction bearing and see if the heave spot rotates to 6 O'clock. If it will set still at any position it is neutral.
2) It is possible that someone had the crankshaft and rotating assembly balanced with that flywheel and harmonic balancer. No idea why anyone would do such a thing.
I just do not think an imbalance would run smooth at all rpm. There would have to have been some vibration at some rpm, if there was a miss-match. Now I seem to fuzzily remember that some 428 Cobra Jet engines had the hatchet on the front of the engine, but maybe not all of them did. If some did not have the hatchet,maybe there was more than one offset imbalance flywheel made.
Here is a link to some different 428/410 flywheel casting numbers. I hope this helps.
https://www.428cobrajet.org/id-flywheel