If you grew up watching Linny, Tuck, and Ming-Ming save baby animals across the globe, you might have experienced a completely different version of the show depending on where you lived! The Wonder Pets! is a fascinating piece of nostalgic childhood media
This is the cynical, business-driven reason. The Wonder Pets was a non-union production in the US. When Nickelodeon wanted to broadcast it in the UK, the British actors' union, Equity, pressured the network to use local talent. Rather than pay residuals to US child actors for international broadcast (or face boycotts), it was cheaper to simply re-hire British child actors and produce a dedicated "territorial version." the wonder pets uk dub