Congratulations, you have a great potential to speak standard mandarin, because 4 and Death sounds differently to you meaning you can distinguish tones in Chinese. The two Words are different, remember Chinese has four tones, 4 has 4th tone while Death has 3rd tone. Also Madarian has many regional variants, speakers of these sub variants may have to struggle to understand each others while none of them would be able to understand Cantonese at all. If we say American English is like Mandarian, and assume Midwest accent as Standard Mandarian, Taxan would sounds like Another Mandarian variant, while Indian English would be Cantonese. It is totally OT, but just for a laugh.