Dash question: '70s dash board same as '68/'69 Cuda?

I've got a '73 Duster I'm updating. I just scored a complete '70-'72 340 instrument cluster with full instrumentation, 150mph speedo and factory tach. It obviously won't fit in my standard Duster slant 6 dash.

A friend said he found a "last '60s" Barracuda dash board for me, and it'll bolt right in to the '73--I'll only need to weld up the hole for the ignition switch as the '73 is on the column.

Can anyone tell me if this is right?

Or do I need to search for a '70-'72 340 dash?

-Brad