yes, we are essentially saying the same thing.
HIE seems to be a fast emulsion (horrendous grain) which is only sensitised to red and IR; the blue/UV is the native silver halide sensitivity. MACO IR is a panchromatic film with extended IR sensitivity.
BTW the Rollei IR 820/400 works fine with a 695 IR filter, and is fast enough with that to allow hand-held shooting. I tried it in a Bessa-L with 21mm Color-Skopar and a Heliopan filter; setting the speed dial to 200 gave good results measuring through the filter. It ended up at something like EI 20.