No easy answer.
First -- the DA3CB1AA had a "button" force of 90 grams.
The replacement series is DB3CB1AA which has a "button" force of 150gr.
The DB5 has a "button" force of 70 gr.
What max force really should be is anybody's guess.

The plain DB3CB1AA is a button type switch with no actuator provided. It expects the user to provide or reuse the existing actuator.
The DB3CB1LB mentioned above is the exact same switch but with an actuator preinstalled. This actuator is what drops the button force from 150gr to about 62gr... and the actuator that is installed is probably not the one you want anyways.

There is no Cherry (ZF) direct replacement for the original DA3's but the DB's are closest, electrically. C&K switches have three options for actuation force. The C&K LCGD part would have been a better choice except these have been obsoleted and are no longer available.

Low current switches (i.e. DB3C) tend to have a lower 'on' resistance than the higher current switches (i.e. DB5C) and are more suited for switch matrixes. Downside to low current switches -- they cannot be used for high current locations such as directly controlling flippers (although some people try this anyways).
The higher current switches (i.e. DB5C) tend to have a higher 'on' resistance than the lower current switches and are not intended for switch matrixes. Tradeoff -- higher button force versus higher switch resistance. Problem with the ZF switches -- they no longer post the 'on' resistance for their switches.

The one in the RS-Online link is simply a DB3C.
Without the actuator -- DB3C-B1AA
These can be found in the US at several places such as here:
https://www.greatplainselectronics.com/proddetail.asp?prod=DB3C-B1AA

The difference between -32, -33, -34? Just the actuator.

You can't just say 'using the actuator' for a comparison as each actuator reduces the force differently depending on overall length.
The DB3C-B1AA is the no actuator version. It is a different part number to get the ones with an actuator and the actuator from the factory is most probably not what you will be using.

To compare apples to apples --
DA3 with no actuator = 90 grams.
DB3 with no actuator = 150 grams (full part number DB3C-B1AA or DB3CB1AA).
DB5 with no actuator = 70 grams.

Installing the same type of actuator on any of these switches will drop the force by the same 'percentage'. This percentage varies widely depending on overall length of the actuator and which set of 'nubs' you are installing the actuator onto (front or back).