These are built as a service by Maurice Janssen, an active OpenBSD user. I have never examined his offering, nor had any communications with him, and have no opinion on your trust question -- you are, after all, trusting the OpenBSD Project and its developers when you install their binaries. If you are concerned with the possibilities of an outside bad actor being able to taint the binaries, you might use the SHA256 file from one site and file sets and kernels from another.
What you are really interested in knowing, I think, is can you conduct an "upgrade" using a -stable release. I use the word release here differently than OpenBSD's twice yearly numbered releases. I mean the collection of kernels and filesets used for installation or upgrade according to FAQ 5 and the release(8) man page.
The answer is yes, you can upgrade. Place the new bsd.rd where you will be able to reach it from the boot> prompt, and select Upgrade from the Install, Upgrade, or Shell prompt.
It would be prudent to back up your system, first.
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