I inherited this tree(s) I'm wondering if I can separate and relocate. Currently on crest of a hill and is at least 10 yo

Here in Australia we used to be able to find blood plums in the shops. They always seemed to be of the same variety, with a dark purple-red skin, along with deep red, juicy flesh, and red juice that would be liable to stain clothing. As I recall, the flesh tended to be soft, but clung to the stone, so they could be messy to eat. But tasty!

Nowadays apparently a cabal of fruit growers/marketers/sellers has decided on uniform renaming of plums in Australia, and so plums are now chiefly sold as "red plums" or "black plums". These descriptions are pretty useless, because the only thing those names indicate is the skin colour! (Which the prospective buyer can see in front of them anyway.) Between shops, and even within a given single batch of such plums, designated either as "red" or as "black", different plum varieties can be present, as obvious (upon eating) from the totally different colours of flesh (and potentially texture & taste). So-called "red plums" may have yellow to orange flesh, typically quite firm, and "black plums" may have orange to light-red flesh, and also fairly firm.

At a higher price one can also sometimes find Queen Garnet or Croc Eggs. The latter is apparently a trademarked name for a plum–apricot hybrid (or collection of hybrids, as their skin has three phonotypes), which — disappointingly — I have seen for sale in one outlet as "blood plums". I don't know whether there's any official definition of "blood plums", but Croc Eggs are certainly not the old-style blood plums, and don't really resemble them closely either.

From Australian experience, the traditional blood plum might have been Prunus salicina 'Satsuma'. Or perhaps Prunus salicina 'Mariposa' ("also called Improved Satsuma"), depending on how long they've been around for — although not if the skin isn't dark purple when fully ripe. In the USA, or elsewhere, it might possibly tend to mean something else.

Questions

1. What is a "blood plum"?
2. Why are plums in Australia now sold by default as either "red plums" or "black plums"?
   
3. Are the old-style blood plums still grown & sold commercially in Australia?
   
4. Why should plums be treated differently from apples? Or mandarines? [The shops are happy to sell fruit under the names Royal Gala, Granny Smith, and Kanzi, and many more, or Imperial, Honey Murcott, and Afourer.]

(My offering to revive this sub) my coffee trees EXPLODED after this planting, and so did my SOH. This is an older pic, the coffee canopy has totally filled out and the SOH is trailing past my balcony now.