Looks like you have the same kind of plant I do. It's looking very healthy, but I would take a safe bet it's not D. spatulata, but the widely spread hybrid D. x tokaiensis. They're commonly sold at nurseries, and when they flower, the flowers often will not open fully and don't produce seeds. It has a wider leaf lamina than spatulata.
Tokaiensis produces seed
<Av8tor1> as big as peat is, the bear runs not him
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Tokaiensis only produces seed if it is the tetraploid new species. The original hybrid, spatulata x rotundifolia, is infertile, and both are widespread in cultivation.
My new D.spatulata doesn't look any different from how I remember this one looking.
In any case, caring for it as if it were a spatulata has certainly worked, so..close enough for me.