Does wallet backup compatibility depend only on the number of seed words?

No. Word count does not determine whether software understands script policy, passphrase use, derivation scheme or specialized backup formats. Funds can appear missing despite a valid seed.

The answer

No. Word count does not determine whether software understands script policy, passphrase use, derivation scheme or specialized backup formats. Funds can appear missing despite a valid seed.

What to do next

Identify the precise wallet standard, account paths and any coordinator policy before trying recovery software.

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