Missing link 7.3 on 7.1

Hello,
Can i use a kmc missing 7.3 link on a 7.1 chain as a emergency should the chain break ?
As a new chain will be required in several months & don't wish to purchase a 7.1 link that costs half a chain price !
Bikes an 8 speed housing an older kmc chain of 7.1 as the next chain will be a 9 speed on an 8 speed cassette.
Thanks
Can i use a kmc missing 7.3 link on a 7.1 chain as a emergency should the chain break ?
As a new chain will be required in several months & don't wish to purchase a 7.1 link that costs half a chain price !
Bikes an 8 speed housing an older kmc chain of 7.1 as the next chain will be a 9 speed on an 8 speed cassette.
Thanks
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