To your two questins:
1. Amplifier as included in the regular Parallel Studio does indeed not have call graph capabilities . VTune Amplifier XE as in the standalone product or in the Parallel Studio XE has a new feature for sampling statistical call graph vs.the "real" call graph in VTune Performance Analyzer. The advantage - overhead is considerably less than call graph in VTune Analyzer, but the behavior is a bit different too.
2. If all you are interested in is indeed the call graph feature then VTune Amplifier XE should be sufficient for you. Since the VTune Performance Analyzer is the predecessor product I guess you can open a support ticket and request access to the old outdated product, if the new statistical callgrpah feature does not meet your expectations
The Embeded Software Development Tool Suite is however indeed the only product that still offers direct IRC download of the old VTune PErformance Analyzer 9.1.