about pressure - 1.4 bar vs 1.8bar

i was all set to get the 1.4bar Stuart Turner at £155 but then saw the
1.8Bar ST at £159!!
My reservations are that the 1.4bar description says "for medium
pressure shower or bath/mixer showers" whereas the 1.8bar says "for
high pressue showers".

if i were to get the 1.8bar, would i need to change my
bath/mixer/shower taps for high pressure taps?