...it appears to me that you have fairly conventional wiring for your existing lights, and that means it *will* be incompatible with the switches you originally highlighted (unless you want to rip the wiring out ;-) ).
As has already been alluded to, there is no neutral at the switch, the black is a switched live, and should conventionally have a red sleeve.
Whilst the following diagram is rather simplistic (since it is an end of circuit, and shows only one light and switch dropped from it - in non-end-of-circuit circumstances, the lighting circuit would continue via another feed *taken at ceiling level* to the next "rose" and switch), by reference to it you can see how the wiring works.
lightwiring.co.uk/wp-content/uploads/2013/03/loop-in-junction-box-wiring-diagram-end-of-circuit.jpg
The majority of the wiring remains at ceiling level. Only the live to the lamp is passed downwards through the switch, and back up again to the lamp via the sleeved black.
At the switch you have only a live-in (and out, when so switched), and if you're lucky, an earth grounded to the box.
There is no neutral at the switch, which you need for your originally proposed replacement switches, which are designed for a different wiring mechanism.
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