Dotted-line guy had the day off! Otherwise it's clearly part of the same line. As the Marx 'influencer' was the Ben Hur sets, it's fitting that we have a teeny-tiny clone/take on it here, with three standard Giant chariots (four horse, non-articulated chassis) and the three figures needed.
"S'mine-now, s'all mine!"
Two red's and a yellow chariot body, with contrasting coloured overlay frets with the fancy, decorative stuff. We know they are/were based on the Marx set because of that fret (which varies between clones and is the best way to ID different sources) and the weird spiky stuff on the front of the cross-bar - which is more of a stabby-spear/de-heading blade arrangement on the originals.
Horses are all the same brown batch, and marking are almost impossible to work out, but they will be genuine Giant 'Smoothies' of one sub-type or another. And we get the Marx knock-off spearman and two of Britains finest (Ulysses) as crew. Both the ex-Marx figure and the chariot wheels are the same brown as the horses - when trying to sort all these HK small-scales, exact shade is as important as markings sometimes for tying things in together!===============================================================
But is it Giant?
Sure as the other two, but I think it might be Boysie-Boy's now!