Any damage to the edge of the tread area is a PITA!!!
Best not bother with a repair.
Does the other tire match the spare?
Can you get a second hand tire to match the other one?
If the size is the same & the tread pattern looks similar, I would go with with such a match.
There are plenty of tires that are different brands but the same tire.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving