The Forgotten Realms Campaign Setting version has a lot of differences to the 2E AD&D original. So many in fact I'm tempted doing a homebrew conversion now.
Oh, the FRCS stats are 3.0. If you include the 3.5 Update it becomes:
Pack Lizard
Large Animal
Hit Dice: 8d8+40 (76 hp)
Initiative: +1
Speed: 30 ft., climb 30 ft.
Armor Class: 15 (-1 size, +1 Dex, +5 natural), touch 10, flat-footed 14
Base Attack/Grapple: +6/+17
Attack: Bite +13 melee (2d6+10)
Full Attack: Bite +13 melee (2d6+10)
Space/Reach: 10 ft./5 ft.
Special Attacks: —
Special Qualities: —
Saves: Fort +11, Ref +7, Will +3
Abilities: Str 25, Dex 13, Con 21, Int 2, Wis 12, Cha 2
Skills: Climb +18, Hide +3*, Listen +6, Move Silently +5, Spot +6
Feats: Alertness, Power Attack, Weapon Focus (bite)
Environment: Any underground
Organization: Solitary
Challenge Rating: 3
Treasure: None
Alignment: Always neutral
Advancement: —
Level Adjustment: —
Related to the giant lizards found in some surface lands, this creature averages 15 feet long (plus tail) and 5 feet wide. The sticky pads on its feet allow it to walk freely over most floors, walls, and ceilings in the subterranean tunnels of the Underdark. Drow and other intelligent races of the Underdark frequently use the pack lizard as a beast of burden. A light load for one of these creatures is 800 pounds, a medium load is 1,600 pounds, and a heavy load is 2,400 pounds. On slopes between 45 and 90 degrees, the pack lizard can carry up to a medium load without falling. On slopes beyond the vertical (that is, when the lizard is upside-down), it can carry a light load without falling.
Skills: The pack lizard receives a +4 racial bonus to Hide and Move Silently skill checks. *In rocky areas or natural caverns, its Hide bonus improves to +8.
Note its skill ranks are Climb 3, Hide 2, Listen 3, Spot 3