The Revell A-330 is almost identical to their A-340 kit, which is unsurprising since the real aircraft are equally almost identical. It was issued only twice, first in Airbus house colours, and then LTU. The LTU kit offered a choice of engines that were not in the first issue.

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Just to clarify one thing, the A330 is a much smaller aircraft than the 777 and they do not really compete in the same market.

Here are some basic specifications (sourced from Wikipedia)
A-330-200
Passenger capacity
253 (3-class)
293 (2-class)
380 (maximum)
Dimensions
Length: 58.82 m (193 ft 0 in)
Wingspan: 60.3 m (197 ft 10 in)
Maximum range: 13,430 km (7,250 nmi)

A-330-300
Passenger capacity
295 (3-class)
335 (2-class)
440 (maximum)
Dimensions
Length: 63.69 m (208 ft 11 in)
Wingspan: 60.3 m (197 ft 10 in)
Maximum range: 10,830 km (5,850 nmi)

Boeing 777-200
Passenger capacity
301 (3-class)
400 (2-class)
440 (maximum)
Dimensions
Length: 209 ft 1 in (63.7 m)
Wingspan: 199 ft 11 in (60.9 m) or 212 ft 7 in (64.8 m) for the LR version
Maximum range: 5,240 nmi (9,700 km) or 9,380 nmi (17,370 km) for the LR version

Boeing 777-300
Passenger capacity
365 (3-class)
451 (2-class)
550 (maximum)
Dimensions
Length: 242 ft 4 in (73.9 m)
Wingspan: 199 ft 11 in (60.9 m) or 212 ft 7 in (64.8 m) for the ER version
Maximum range: 6,005 nmi (11,120 km) or 7,930 nmi (14,690 km) for the ER version

Note the 777-200 and A-330-300 which were the first production versions respectively. They are very close in size and passenger capacity. The A-330's slightly smaller passenger capacity was made up for by a substantially longer range. At the time they were launched and the airlines made their first orders they were certainly direct competitors. In the almost two decades since their introduction, the 777 has been stretched into a much larger and longer-ranged aircraft where the -330 was not given that Airbus preferred to develop the A-380 instead. The markets have evolved to suit the aircraft in a way they had not when the two were first rolled out and each design has found its niche. The A-330 has pretty much lost out to the 777 in the long range passenger market, but definitely beats it in the military market.