ABC+ and "rollo" are the same. Harald Leban worked out the formula and called it ABC+, Formulary sells it as such, B&S sells it as "rollo".
As for suitability, PMK makes splendid negatives for contact printing in Pt/Pd when used in trays. ABC+ is a better choice for rotary: it's designed to minimise excess stain that results from rotary processing in PMK. There have been comments about PMK not producing contrasty enough negatives for a specific Azo/amidol combination: this could have to do with spectral response differences between this Azo approach and Pt/Pd since PMK produces plenty of contrast for the softest palladium formulas, provided development time is long enough.