What is the pronunciation of 着重? According to Pleco:


zháo zhòng: emphasize; attach importance (v) / emphasis (n)
zhuó zhòng: stress; emphasize (v)


Both use 着重 as its characters. The first one lists a noun as well as a verb as its usage but the second one only lists a verb.

According to 网易有道词典, it only lists the latter.

Usually, if the pronunciation is different, the meaning is differen as well. For example, zháo means touch while zhe works as a particle, even though both are written as 着.

But in this case the meaning looks the same. So why do two forms exist and which one I should use?
Edit: I was born in H.K, I would accept the Hong Kong's standard

/zhuó zhòng/ is the standard reading of 着重

There's a 著 , 着.discussion on this subject here http://www.cantonese.sheik.co.uk/phorum/read.php?14,139780

著 in 衣著 is pronounced /yī zhuó/ 

著 is used in place of 着 in Taiwan

In summary:  

着= /zháo/

着重 = /zhuó zhòng/ (in this compound , 着 is read the same as 著 in 衣著)

著重 = /zhuó zhòng/ (only in Taiwan)

The editor at Pleco might had considered 着 and 著 the same character in this compound (accepted both Taiwan and mainland China's standard),  and listed both single character's pinyin.