CmdIndustryGSEvent:
p1[00..15] = industry id
p1[16..31] = unused
p2[00..31] = custom data vor var 10 resp. 18

CmdIndustryAreaGSEvent:
tile = start tile of area
p1[00..07] = X extend
p1[08..15] = Y extend
p1[16..23] = industry type
p1[24..31] = unused
p2 = custom data vor var 10 resp. 18

Both commands trigger two callbacks for each targeted industry:
CB 29 (random production change) variable 10: 32 bits from p2
CB 25 (animation trigger for all tiles) variable 18: 32 bits from p2