Hi @AndyHull - ah there you are! Wondered what had happened as no 'Thanks' or 'Like' tag to earlier advice.
To help further though ...
... a really useful resource is Dr. Roland Ranfft's website on watch movements. So if you google, for instance, ranfft EB8800 and click on the first link that comes up you'll see your movement along with those in the same family. On the left under 'Data' you can see the info that shows that these movements came with 0, 1, 17 or 21 jewels, run at 18,000 A/h etc. On the right you'll see the family information.
In general then, yes, you can exchange parts within the same immediate family e.g. they have the same ligne size, same amplitude etc.. Most often a movement family starts with a base manual wind model ... then the next step is to add a date ... then a day ... then an automatic etc. No reason that a common part from one member of the family won't fit another movement in the same family. The maker of the watch (Adrem vs. Roxedo in your case) is not relevant ... it's the movement (family) that is.
Your budget watch seems to be coming on nicely and is a really good (and cheap!) way to find your way around a movement etc.