Accidentally changed table prefix of previous WP installation

Hello,

I was doing another wordpress install in my existing database for a new subdomain and I accidentally uploaded the config.php file to the wrong folder (one that had a different installation/ website in it). Obviously the config.php now has the wrong $table_prefix. POOF my old website was gone. I edited this file back the correct $table_prefix for this old site, but it is still gone. I am 99% sure I re-added the correct $table_prefix to the old file… but is there any way to check if the old $table_prefix was different? In any case, is the old site just simply gone with than one mistake?

Thank you,

Fred smith