Fulham striker Collins John put the Dutch ahead when Liam Ridgewell failed to cut out Edson Braafheid's cross.
Birmingham hit back as Liam Ridgewell bundled in James McFadden's cross and survived three late David Ngog chances.
The visitors had been denied the lead when Yakubu's shot was cleared off the line by Liam Ridgewell.
Birmingham were unlucky when a header from Liam Ridgewell was disallowed late on despite the ball crossing the line.
Davies will emulate midfielder Craig Gardner and defender Liam Ridgewell as former Villa players plying their trade across the city.
Prior to Torres' substitution, Steven Gerrard had given Liverpool the lead early in the second half, but Liam Ridgewell quickly pulled Birmingham level.
Just before the break Blues striker Marcus Bent was denied a penalty while Kightly saw his effort cleared off the line by defender Liam Ridgewell.
Maynor Figueroa rifled a shot wide for Wigan before Liam Ridgewell headed wide at the other end, and Foster saved low down after N'Zogbia tried his luck.
His delightful ball inside the full-back teed up Liam Ridgewell for a low cross from the byeline, which Matt Derbyshire could only poke wide from inside the six-yard box.
First Holland goalkeeper Boy Waterman failed to deal with a free-kick and the ball fell to Liam Ridgewell, but his shot on the turn was deflected wide by John's outstretched leg.
Liam Ridgewell, possibly distracted by Johnson's return, allowed Hoilett to nick the ball off his toes and the Canadian youngster coolly took the ball past Foster and slotted into an empty net.
Bruce has signed nine players this summer as he bids to keep Birmingham in the Premier League, but only four - Fabrice Muamba, Garry O'Connor, Stuart Parnaby and Liam Ridgewell - are British.
And five minutes later he put Arsenal in the lead after seizing on a mistake from Liam Ridgewell, drifting past two City defenders and rifling his low effort past the reach of Taylor.
He had already badly miscued an effort wide from a Liam Ridgewell cross and then seen Gordon save well with a foot after he had run clear on goal before once again finding himself with only the keeper to beat but this time finding a finish of quality to side-foot inside the far post.
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