Sorry for my missing enthusiasm, but from an RF perspecitve this repair is absolutely substandard.
Why not wait for a proper replacement mixer so signal integrity is preserved ?
If it works & meets specs, the only objection can be aesthetics.
When I worked in TV & Radio Broadcasting, we often had to subsitute equivalent, if "different looking" components to maintain service, especially with equipment from Europe.
Many of the EU manufacturers had an "Australia? -----------Too far away, let 'em wait!" attitude!
On one occasion, a 10 kw Thomson TV transmitter had its 28v high current DC supply fail.
Repair or replacement?
Repair was measured in weeks (if we could get the parts), replacement in months, which was not good enough for the owners of the Tx, who were a country commercial station, with no backup transmitter.
As luck would have it, we had a spare 32v Power supply from an NEC transmitter, belonging to the National broadcaster, who agreed to a loan.
It could be shifted down in voltage, & still had sufficient current capacity.
The problem was, it was much bigger than the failed one, so it sat outside the Thomson, with big, thick cables making the requisite DC connection.
The NEC was fully enclosed, so was safe by the standards of the day, but these days, people would scream Aieee! & run around in circles!
The NEC supply did sterling service for months, till the replacement Thomson unit arrived.