No. As Tse has explained, Peranakan Chinese only constitutes a miniscule portion of the overall Malaysian Chinese population. The Peranakan arrived earlier after the Zheng He voyages, while the majority of the Malaysian Chinese came during the British period. Because of the long period of assimilation, the Peranakan has adopted many of the local Malay cultures, such as using Malay language in everyday speech, clothing and food. However, they still practice Chinese customs when it comes to religion.
The vast majority of the Malaysian Chinese, on the other hand, came in large waves during the British colonial period, when additional labour was needed for building of infrastructure and the mining of tin. Most of these immigrants are from Southern China, mostly Canton & Fujian province. Due to arriving in these large waves, there were hardly any interactions with the local population, and as such, most Malaysian Chinese, even till this day, maintain almost all of its Chinese customs, more or less. Again, so called "Westernized" Malaysian Chinese only constitute a minority, and as others has eluded, due to Malaysia's social and inter-racial fabric, Malaysian Chinese have a very acute understanding of who they really are. Now, of course, among the "Chinese educated" group, Hong Kong and Taiwanese influence are also quite prominent, so that's how you get people like Namewee here, but although not insignificant, I wouldn't consider them to be the majority.