Thank you for the very kind offer!,I could either send you a cutting or grow it for you and send you the plant in spring,it's your choice.It will be interesting to grow them side by side.They may be the same unique individual tree,maybe with a few mutations over the years that it has been passed around,,alternatively they could be siblings,either from the same mother tree or the same cross.If they are siblings then there could be some clear differences,if they are the same the differences might be more slight.I have 3 plum trees,all seedlings of Blaisdon Red(from the Forest of Dean),open pollinated so unsure if the parent on one side but all Blaisdon mothers.two are small,weak,low vigour and susceptible to disease,leaves are pointy,glossy and smooth,these are all 1ft tall after 2 years.The third is 3ft tall,healthy,strong and happy,rounded leaves,bumpy and light green.
If Michurinska and Ali Pasha are the same,if they are grown alongside,same conditions,I would expect to notice some differences,we will see,I'm hoping they are different,Bulgaria haste wasp in the south so there should be quite a few unique varieties there thanks to the birds doing what they do