DIGG tokens count towards the boost the exact same way than BADGER tokens do, but with a few considerations proposed in BIP-92 (https://forum.badger.finance/t/bip-92-digg-restructuring-v3-revised/5653): no matter how much it’s priced, DIGG counts as 1 BTC worth towards the boost, while it also has to be paired with other native assets in order to be fully counted. Example: If you hold 1 DIGG and it’s currently worth $22,000, while BTC is is worth $24,000, your DIGG will contribute towards the native balance of the boost as if it was priced at $24,000 as long as you hold another $24,000 worth of other native assets, like BADGER. As a result, you would end up with $48,000 in native positions.
bDIGG is an interest-bearing token that used to get by depositing your DIGG on the DIGG single asset sett on Badger. If you have bDIGG you can trade it back to DIGG by simply withdrawing at the app.