I haven't compared the physical reservoir tanks in recent years but 4 different part numbers.
2010-2013 w/headlamp washers
Washer Fluid Reservoir. HEADLAMP, CLEANER, Windshield. Lexus GX 460. Genuine Lexus Part - 8535560200 (85355-60200)
parts.lexus.com
2014-2019 w/headlamp washers
Washer Fluid Reservoir. HEADLAMP, CLEANER, Windshield. Lexus GX 460. Genuine Lexus Part - 8535560240 (85355-60240)
parts.lexus.com
2020-2023 w/headlamp washers
Washer Fluid Reservoir. HEADLAMP, CLEANER, Windshield. Lexus GX 460. Genuine Lexus Part - 8535560320 (85355-60320)
parts.lexus.com
2010-2023 without headlamp washers
Washer Fluid Reservoir. CLEANER, HEADLAMP, LEVEL. Lexus GX 460. Genuine Lexus Part - 8531535340 (85315-35340)
parts.lexus.com