Kevin is closer. Bluetooth 4.0 is the version of the spec that introduced Low Energy, so „BLE“ is part of 4.0 and every version after it. A „Bluetooth 4.0“ device can be classic Bluetooth, BLE, or both. For battery sensors it’s almost always BLE in practice. Ask the first vendor to confirm in writing.

The bigger question is your second one. Hermetry takes data over MQTT, HTTPS or LoRaWAN, so neither sensor talks to it directly. You’d need a gateway near the motors that listens to the sensors and reports each one as a child device in Hermetry (one gateway login, each sensor shows up as its own device with its own history and alarms). That only works if the vendor documents what the sensor sends: the advertising format, or the BLE characteristics to read. If the data only ever goes into their phone app and they won’t tell you the format, it’s not getting into Hermetry, whatever version it is.

So the question to send both vendors: „Is the data format documented so a third-party BLE gateway can read it?“