While the code for generating the water texture in Pocket Edition before v0.14.2 (the first version to implement animated texture files, making it safe enough to assume that this version removed animated textures generated by the game) was likely identical to that in Java Edition, the random number generator employed by each edition was different: Java Edition (and likely also the console editions given their matching terrain generation around TU0) used LCG for random numbers, whereas Pocket Edition, being C++-based, used MT19937 for this instead (source: Kay on the MC@H discord).
As such, while the code for generating the water texture itself may have been the same as it was on Java Edition, between the time it was introduced to Pocket Edition all the way up to v0.14.1 (although it'd be wise to check this is actually the case, as there may be further subtle differences), different results will be produced even if starting from the same seed.
Split from #4.
While the code for generating the water texture in Pocket Edition before v0.14.2 (the first version to implement animated texture files, making it safe enough to assume that this version removed animated textures generated by the game) was likely identical to that in Java Edition, the random number generator employed by each edition was different: Java Edition (and likely also the console editions given their matching terrain generation around TU0) used LCG for random numbers, whereas Pocket Edition, being C++-based, used MT19937 for this instead (source: Kay on the MC@H discord).
As such, while the code for generating the water texture itself may have been the same as it was on Java Edition, between the time it was introduced to Pocket Edition all the way up to v0.14.1 (although it'd be wise to check this is actually the case, as there may be further subtle differences), different results will be produced even if starting from the same seed.