Indeed, as far as I understand it Square D were manufacturing equipment under the federal brand up until approx 1997 when they dropped the name.
That explains the newer federal stuff (painted a brightish blue colour, rather than grey) that was better shrouded inside and had MCBs to BSEN60898... that standard didn't come out until the 1990's and federal as a separate company had gone out of business long before then
I am aware of the problems with the yank made original federal boards, but am unsure whether the UK stuff of the same age suffered from the same defects, although I do remember an incident involving a trapped twin and earth which shorted and the fault blew itself clear and left the breaker in the on position and half the circuit still live, Zs was out of spec though.
