As Kassey Lee explains in this post, a developed .cn domain corresponding to your .com does not necessarily mean you have found a potential buyer for an upgrade.
It’s time to look at some 4-character domains sold in June and see if they may appeal to end users in China as upgrades. This can be done by checking both .cn and .com.cn domains of the corresponding .com sold.
TA88.com sold for $5,800. TA88 .cn forwards to HGG696 .com which looks like a betting site. The site erroneously states that its name is Crown .com but the domain actually belongs to a large Chinese forklift truck manufacturer. So, TA88.com is unlikely a potential upgrade for TA88 .cn.
FX66.com sold for $1,400. FX66 .cn is a forex investment blog where FX is short for forex and 66 is often linked to the Chinese idiom Liu Liu Da Shun (六六大顺=everything going smoothly). The site seems to be inactive with the last blog entry posted in 2017. FX66 .com.cn is developed but its contents may not be original. So, there is no strong motivation for either site to upgrade to FX66.com.
i111.com sold for $810 and is for sale at 28,880 yuan ($4,100). i111 .com.cn seems to be developed but I had a problem viewing the site. Its page source indicates that the site owner is Chen Ming (晨明=daybreak brightness), a large group of companies operating in finance, real estate, logistics, and many other fields. In this case, ChenMing.com would be a better choice than i111.com as an upgrade for the company.
66DS.com sold for $600 and is for sale at €28,600 ($33,000). 66DS.cn is owned by Da Shun (大顺), a company which provides waterproofing to tunnels and other public infrastructures. DS matches the company name but 66 seems to be unnecessary. In this case, DaShun.com would be a better choice than 66DS.com as an upgrade for the company.
WC11.com sold for $557 and is for sale at 13,880 yuan ($1980). WC11.cn is a very basic blog and it does not seem to have any serious contents. The domain does not match the site title Fo Shan (佛山). So, WC11.com is unlikely a potential upgrade for WC11.cn.
As you can see, brand-matching is still an issue faced by end users in China, which makes the search for buyers more challenging. A developed .cn domain corresponding to your .com does not necessarily mean you have found a potential buyer for an upgrade. You must first determine if the .cn name matches its brand.