I guess you bought those "Secret Shrimp Society" ones that are packed in small white packs? Those could be considered "marimo balls" too, just that they are man-made hand-rolled versions (you can see the filaments look like rolled). Its quite common for some sellers to rip apart larger ones and roll them into smaller ones.
Naturally grown marimo balls have a fuzzy type look, where all the filaments point outwards in a radial pattern.
Check out this article for some comparisons:
https://www.mossball.com/content/beg...ke-marimo.html
If you have an opportunity to find the larger naturally grown marimo balls at LFS, you can see the differences quite easily.
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