Of course, the closed source versions (Thales eSecurity by any chance?) have certification and has additional hardware security.
Most notably by having the key store and processing wrapped in a secure tamper-proof enclosure so that any access causes the keys to be wiped.
Edit: Looking further, the board has at least one component with a heatsink. When tamper-proofing such a board, heat management is very difficult, especially if you want any sort of decent performance.