One wears a red hat to trackwork and the other wears a blue one and that's how trainer Gary Portelli differentiates between identical twins Nathan and Tommy Berry.But one thing he knows for sure is that both three kilo-claiming 17-year-olds can ride.Portelli has Nathan riding four of his horses at Rosehill on Saturday while Tommy rides Zarock for the Warwick Farm horseman at Kembla Grange on the NSW south coast."You don't lose anything with either of the boys, they are both very promising young

One wears a red hat to trackwork and the other wears a blue one and that's how trainer Gary Portelli differentiates between identical twins Nathan and Tommy Berry.

But one thing he knows for sure is that both three kilo-claiming 17-year-olds can ride.

Portelli has Nathan riding four of his horses at Rosehill on Saturday while Tommy rides Zarock for the Warwick Farm horseman at Kembla Grange on the NSW south coast.

"You don't lose anything with either of the boys, they are both very promising young riders," Portelli said.

"Tommy had some good rides at Kembla and their manager Jeff Brian decided Nathan would ride at Rosehill."

Tommy steered the Portelli-trained Absent Friends to victory at Wyong last week and Nathan will ride the entire in Saturday's Red Rock Deli Hcp (1500m).

"They could do a swap and I wouldn't know, one wears a red hat to trackwork and the other wears a blue one, that's how I tell them apart," Portelli said.

Nathan Berry is looking forward to making the most of his opportunities while Sydney's star riders are in Melbourne for the spring carnival.

"This is the time when us apprentices have a chance to make a statement," he said.

Nathan said there was always friendly competition with his brother.

"Tom's more competitive than me but I'll be quick to sledge him if I ride a few winners tomorrow and he'll do the same if he rides a few," he said.

"I've ridden 10 metropolitan winners and Tom has ridden two, so I'm on top at the moment."

Portelli said the rivalry between the Berrys was not confined to racing.

"Tommy was asked in an interview who gets the most girls and he said `I do because I'm better looking'," Portelli said.

"He meant it too."

Five of Nathan's winners in town came last year in Perth where he and Tommy rode during the three-month equine influenza outbreak that stopped racing in NSW.

And Nathan, who scored his first Sydney winner on the Guy Walter-trained Summer Daze at Canterbury in June, said the trip to Western Australia was a turning point for both of them.

"We had about three winners between us when we left but we got so much confidence over there and confidence is the key in the racing game," Berry said.

Nathan Berry's other rides for Portelli are former Peter Snowden horse Sacred Orders, two-year-old debutant Engulf and Test Edition.

His last ride of the day is the dual Group winner German Chocolate in the Birds Eye View Handicap (1400m) for trainer Paul Cave.

"As long as the track stays dry they shouldn't be able to beat him, he's a top horse," Berry said.

Berry rode the six-year-old in May when he ran fourth to Approach The Bench at Randwick.

"Paul has been a very good supporter of Tom and me and I'd love to pay him back by riding a winner tomorrow for him," Berry said.