I only see the Patons Inca on the Patons Australia list so maybe it's only sold down there?
But they have different content so no, they aren't the same.
~Info from Ravelry~
Patons Inca - Bulky yarn,
50% Wool, 30% Acrylic, 20% Alpaca,
13.0 sts = 4 inches
Patons Rumor - Super Bulky,
84% Acrylic, 15% Alpaca, 1% Polyester,
12.0 sts = 4 inches
Needle 10.5 US - 6.5mm
That what you need?