Yes they do.
The past participle of "get" is "got" in British English and "gotten" in American English.
The past participle of "get" is "gotten" (American English) The past participle in British English is generally "got"
The past participle of "burn" is "burned" in American English and "burnt" in British English.
The past participle of "focus" is "focused" in American English and "focussed" in British English.
The past participle of "sneak" is "snuck" in American English. In British English, the past participle can also be "sneaked."
The past participle of the verb to get is gotten.
The past participle of signal is signaled. (Or signalled in British English)
The simple past and past participle are both spelled. Spelt is also used in British English.
The past participle of "spit" is "spat" in UK English and "spit" in US English.
The simple past and past participle are both learned. 'Learnt' is also used but this is mostly in British English.
The simple past tense is got. The past participle is generally got in British English and gotten in American English.
The past participle of "avoir" is "eu".