It’s literally the same thing. Ui Ui explains it:
By using your life as the trade off you can remove CE limits. He is talking about this for the crows.
There is no implication of Mei using the Binding Vow on herself for the crow but let’s say she did, there is zero implication that each would be weaker OR that she can’t use it more than once. She has literally used it multiple times in the past including on Gojo and even says “Are you willing to die for me” to the rest of crows vs Kenjaku, which is why he took her more seriously than he did Choso in the beginning.
Each crow is a Bird Strike. And each Bird Strike is lethal. Anything else is speculation.