I think I see two different mints represented there Lima and possibly Potosi.
Can you provide all the info you have on where they came from please... As in where they were recovered.
Since I can't weigh them im just guessing by size that they are 2 and 4 reale cobs.
Here's the same four coins in two different plates, coins are in the same position and just flipped. (I've since given a few away to a couple of interested kids and a close friend.)
All I was told about these coins is that they were authentic 1744 1-reales.
We can use the following "A,B,C,D" arrangement as reference to each coin on the plates: A B
C D
They are definitely not all the same denomination and not all from the same time period.
This one for example shows the shield type design that went out of service in 1733
This shows the pillars in waves design that was in production much longer and I believe I see a date of 44 on that one(1744)
This photo seems to show their size much more similar to one another.. If all of them are one reale coins the smaller would be half reale.
Three out of the four show the Greek cross.. The thin one.. The smaller one with the thicker cross appears to be the 1744 likely minted in Lima Peru