There are ultrasonic sensors and ultrasonic sensor boards… some are all in one and will interface with an MCU, others are just the transducers and need the control circuitry (sold separately) to even work. And yet others may be proprietary and may not interface with any MCU.
Since none of that is Blynk specific (as in Blynk doesn’t control or read directly from the sensor anyhow), I recommend you Google for basic Arduino use of each type you look up. If you can Arduino find code for it, then it can be adapted to Blynk for the interface.
Personally the HC-SR04 waterproof ultrasonic sensor looks like a basic HC-SR04 in a waterproof casement, so should work nicely with normal Arduino code. I have something here to use as an example
The other one is hard to tell what it is…