Unfortunately it wont have either. A lot of the models left from coh1 don't anymore (probably cause their sound and visual effect files were deleted).
For the sound however you can try this workaround (though its not perfect)
I use the following workaround to create the sound:
Clone "ebps\races\west_german\buildings\defensive_structures\med_supply_stash" and give it a unique new name.
Remove "construction_ext"
Empty the actions list in "action_apply"
Change the "entity/blueprint_ext/animator" to: armies\british\weapons\3in_mortar\3in_mortar
Then go to the weapon file of your mortar bunker and set this in "fire":
"mortar_sound" is the new created object.
The firing effect is working normal for me and don't recall doing anything special for that. It is possible to force it with "animator_set_action" in on_fire_actions (outsite the spawn_entity). Set action_name to: 60mmmortar_fire_fx