If im reading this correctly you want to duplicate the tape playing in VCR 1 by using VCR 2 to record.
If your VCR's have RCA conections on them you can use these.
Take the video and audio outputs from VCR 1 and plug them into the video and audio inputs on vcr 2. This should do the trick. Let us know how things work out.
Cheers,
Glenn