You bring up an interesting point here, that Bitcoin within a simulated reality or testnet could potentially hold real value, even if it is a fundamentally different version than the "real" Bitcoin on the mainnet.

When it comes to value, what is important is not the specific physical or digital characteristics of Bitcoin, but rather the social and economic agreement that it has value. In other words, Bitcoin's value comes from the collective agreement among users that it is worth something, whether this is through its rarity, decentralization or other attributes.

Therefore, if the users within a simulated world also agreed that a particular version of Bitcoin had value and were willing to use it as a medium of exchange or store of value, then it could hold real value, even if it is a different implementation or iteration of Bitcoin than we see on the mainnet.

Overall, whether or not Bitcoin within a simulation has value, it remains a philosophical question that is difficult to answer with certainty.