BLE configuration for radio test : RADIO_MODE_MODE_Nrf_2Mbit vs RADIO_MODE_MODE_Ble_2Mbit

I am currently developing a feature for a BLE module to pass certifications (BL654 Laird, based on nRF52840).
My application runs on SDK 15.0.0.

I used the "radio_test" module (nRF5_SDK_15.0.0_a53641a/examples/peripheral/radio_test/).
What is the difference between RADIO_MODE_Nrf_2Mbit and RADIO_MODE_Ble_2Mbit?
Which one should I use for my radio tests?

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