Tree ID?

Can anyone confirm if this is a known sour cherry rootstock (or maybe unnamed cerasifera rootstock)?

I believe this plant originated as a runner from the rootstock of my neighbor’s ailing Montmorency tree, as these come up all over my lawn, and when I dig them up they are coming up from long horizontal runners, and the leaves seem to match what I see coming from the base of their tree:

I’m hoping to graft something onto it next year (or maybe even bud it this summer), but just wanted to ID it well enough to decide what might be compatible.

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Looks just like the rootstock of a ‘Stella’ cherry I cut down.

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