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I have both. OCD symptoms can definitely fluctuate, they've fluctuated a lot within my life. I've had moments of relative calm, including one fairly long stretch of time where my symptoms were so mild they could maybe be considered subclinical; only for it to reemerge later and send me into some of the most hellish OCD spirals of my life.
I honestly don't feel like the symptoms overlap for me at all, but that may have to do with my current OCD themes not being really centered around checking.
I agree there’s not much in common. The internet tells me they’re kinda similar tho. The first video I found basically said if you think you might have both, you can’t, just do OCD treatment and see if things improve. I think the similarities are if you’re obsessing you’re probably inattentive and with ADHD you ruminate, and I know I’ve acted compulsively around under stimulation, but maybe that’s because I have both.