Both routine transmissions and size-up will be different.
E41 AFK 4 fuel BRB.
T25 OTS 2 sto sfd OMG! WRKR!
Planning lunch could be interesting
T51 2 E51 WRUD 4 Lunch?
E51 2 T51 711 Subs
T51 2 E 51 Yuck
E51 2 T 51 YMMV
The fire ground will “sound” different as well.
Batt 4 2 Cnty. HV 2nd Alm stge out.
E51 RU in Staging?
E51 Affirm ZZZZ
And the occasional confusion or differences over water supply assignments….
E15 2 E12 PU My line @ 3265 NY Ave
E12 2 E15 Hv my own hydt, BLNT!
Makes one fondly recall the days of the 10 codes……..