No experience of either of those lights specifically, but barakta's trike has been happily running a pair of Spanninga Pixeo rear lights (wired in parallel) along with a Cyo from an Axa bottle dynamo[1] with no noticeable effect on the Cyo's performance (the rears are unpluggable, so it's easy to confirm). It seems reasonable to assume that LED front lights are designed to work with tungsten rears, so a pair of typical LED rears shouldn't be too taxing (with the disclaimer that the current draw linked above for the Secula isn't typical - it's nearly as much as a tungsten lamp would draw).
[1] Now the trike's got an electric assist, I've replaced the dynamo with voltage-regulated 7.5V DC, as per the Cyo's spec. The whole system draws well under 3 watts steady-state[2], including ~10% regulator losses. Sadly I don't have measurements under dynamo power.
[2] Current draw is higher at first, as the standlight capacitors charge.
