AOSP custom ROM downgrade

Hi guys. I have a (Non bricked!) Xt1068. My question is as follows: I know that installing Android 6.0 OTA and then downgrading to LP will brick the device because of the bootloader downgrade. If I install a custom ROM such as AOSP-RRO-6.0.1-20160402-titan-vidhanthbafna and try and downgrade using AOSP-5.1.1-20150531-titan-luk-OLD for example. Will I brick my phone? :p

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