SIGHASH mediated tx modification

If Alice broadcasts a tx with an input tx_in1 and output tx_out1 signed with SIGHASH_ALL | SIGHASH_ANYONECANPAY, it lives temporarily in the mempool. Bob chooses to be apart of the crowdfund and he adds an input tx_in2 to the transaction, but then what? Does this new transaction replace the old one in the mempool? Is it added separately? Also what does that mean for spenders of the original tx_out1 Alice constructed if the latter is the case? Wouldnt that second transaction create another UTXO meaning the spender can create a tx_in that would have two choices of UTXOs to reference?



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