The first part of each LUT's name indicates the input colour space in expects. e.g. ACEScct_Rec709ODT_EE.cube expects the source to be ACEScct.
They all transform the input to ACES linear, then apply the RRT followed by the Rec.709 ODT.
The EE or LL part of the file name follows the ARRI LUT generator convention for input and output range.