You will be much better off taking a methodical approach here instead of thrashing about wildly.
i've installed (added remi from the extra repos page)
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php73-php-pecl-imagick-devel-3.4.4-9.el6.remi.x86_64
php73-php-devel-7.3.25-1.el6.remi.x86_64
Those are el6 packages. v10 uses el7 packages.
You have a working v9 with el6. You do not need to add anything there.
You do not need the extra repos on v10 - the safe repos are already there.
SUpport of the web application say its a database issue, but im using the database of the old server (for testing) and the fault persists.
So it has some logs somewhere.
So how are you accessing the old DB from the app on v10? What does the v9 DB say?
Does the app have permission to access it? Can the v9 mysql57 be accessed using TCP and through the firewall? What are the mysql57 settings on v9? What are they on v10?
You need to stop trying to leap to conclusions, rewind a bit, start doing things logically, and write stuff out so we can follow a path. We can't just leap in part way through and understand what you have done or we will end up with another XY problem.
https://xyproblem.info/If someone asks you for some information then post it eg what a does this say?
from your previous sme9 you need to check which version of php you were using, as it seems from first post 7.3
then
rpm -qa |grep 73|sort
then do on new server
rpm -qa |grep 74|sort
Please don't randomly install packages in the hope you can fix it - that will just clutter your system and make it more difficult to diagnose, and break stuff.
And I am sure you are probably under pressure to do this NOW, but then it should have been done a long while back. v10 has been out for some long time.
You need to take your time and don't cut corners in a desperate rush to try and fix it.