Pixel 4a `sunfish` upgrade via sideload? (`3.04-a15` on top of `3.04-a14`)

Is there a chance to perform upgrade on sunfish via sideloading 3.04-a15 on top of 3.04-a14 w/o dataloss or the like?
(I know there´s never guarantees … no worries, I only need something like a rule of thumb)

edit: I just realised I did a dirty upgrade already from u to t, so I might just go for it again this time…

edit #2: dirty upgrade via “local update” worked w/o any obvious flaws…

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I did the same on redfin, local update in the updater. Just to add more Pixels for others to know

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Thanks for this post!
I never did a dirty update before, but you were so positive here that I gave it a try on my sunfish.
Everything went smoothly without problems!

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It doesn’t go so smooth always. But for a14 to a15 it works.