Frosted/Specimen Finish Vs Brilliant/Proof-Like

I have some coins which I have been slowly going through over the years;
This is about two 1973 RCMP quarters that I happened to notice.

Now, I have observed mostly on high grade 1967 dollars and half dollars that one can find what might be considered a frosted and a brilliant finish on coins issued for circulation for the same year.

I had previously chalked this up to something on the higher denomination silver coins;
But come to think of it, I have observed that some year/denominations, I did observe what I thought was a frosted finish - but I mostly ignored this because I figured it was just marked up from circulation.

I just noticed that these two quarters have this same thing going on, and I am wondering if this is considered a variant or not;
In the case of the frosted quater, the background I am seeing more of what the mint lately called a 'specimen' finish - in that the background isn't a glassy polished finish, but a clean one with striations (at a glance you might think it's a lower grade, but it isn't.)

Some background;
These were collected by my wife's grandfather when they were new;
These were a part of a home made roll of which these were the end coins;
The roll had masking tape to keep the roll closed, and it covered (one side of) the end coins.

I had let these coins both soak in some goo-gone for a couple days to get rid of the (fifty year old) masking tape, and while cleaning these two off, the finish really popped out at me.

These are both either low circulation, or uncirculated coins.









Is this comparable to the "weak strike" and "strong strike" variations of George VI coinage?

Is the 'frosted' possibly from a new die, and the 'brilliant' from a well polished die?

I would genuinely appreciate the community's thoughts on these.

(I do not have any way of getting better pictures, these were captured from my iphone as best I could, and cropped/downsized to be uploaded.)