Linux data restore

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Hello, I need help.
My hdd doesn't mounts.
I've done ddrescue from the end to file.
I've also done ddrescue from beginning to another file (this part is too small).

How I can connect this two parts to one?

I've restored photos and videos from files with photorec tool, I've also restored a lot of another things, but I have problem.

I need to restore one tar.gz file.
I have part of this after photorec, but this tar.gz is crashed.

I know date of the file and the name, which photorec gived to restored file. Do I have any way for manual restoring of this tar.gz? or what I can do with ddrescued's files with any another tool for this tar.gz?

So main problem is in recovery of one this tar.gz file, what I can do?