Your typical Gel battery has a recommended charging voltage of around 14.3 to 14.5 volts. Your typical AGM battery has a recommended charging voltage of around 14.4 to 14.8 volts. The Gel battery isn't as tolerant of higher voltage as the AGM so it's important to know which you have. I wouldn't be charging a gel battery at 14.8 volts.
General charging information for AGM and GEL batteries | Discover Battery
I wouldn't be concerned about coupling a flooded cell and AGM battery together.
Deano
66 SIIA SWB .......73 SIII LWB diesel wgn
86 RR 'classic'......99 Range Rover P38a
94 Defender 110..95 Defender 130 Ute
96 D1 300TDi.......99 D2 TD5 (current)
04 D2a Td5..........02 Disco 2 V8
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