I've reused the 1.6 stretch bolts on the con rods. I just torqued them to spec, and then went another 1/3 to 1/2 turn. No problems.
Having said that, I probably would not do it again, and don't usually recommend it.
No experience with the AAZ bolts, but I imagine they are the same for 1.9TDI, so should be readily available from aftermarket sources.