That is mostly incorrect...
I have never personally seen a dry cat food bellow the mid 20% protein levels, but yes canned cat food 'appears' to have less protein but it's only because of the added water, a big often overlooked fact in this discussion... Generally canned cat food has much higher overall protein levels then dry food...
The % distinction between wet and dry feeds is huge, dry cat food has about 10-12% moisture while canned cat food about 75-78% moisture, two entirely different ends of the spectrum...
Protein on foods is listed as a percentage by weight it's not adjusted for moisture content, when you add water to the feed that percentage of other nutrients like protein plummets, when you remove the water the percentages climb...
Lets assume a canned cat food is 75% water (as most are close to that) and says 11% protein as the OP suggested their can says, to get a comparison to to dry feed protein content you do this math bellow...
(protein percentage / dry percentage) x 100 = dry equivalent percentage
So in this case, that 11% can of cat food (with 75% moisture) is about 44% equivalent dry feed protein... (11 / 25) x 100 = 44% dry protein equivalent...
And this same math applies to eggs as well...
Eggs are about 74% water and 13% protein, so we do the same math, and find eggs are about 50% protein when dry... (13 / 26 ) x 100 = 50% dry protein equivalent...
In the end eggs and likely all cat food is higher protein content then most all chicken feed...
To the OP your 11% canned cat food (about 44% dry protein equivalent) will provide a significant protein boost over chicken feed...
The FDA even has a webpage about this, and explains it in much further detail if you are interested...
http://www.fda.gov/AnimalVeterinary/ResourcesforYou/ucm047113.htm
** On this same note the recommended say 16% protein level for chickens in dry feed already factors in the moisture content of that feed for consumer ease...
In actuality a 16% poultry feed (assuming 10% moisture) is probably closer to 17.8% dry protein equivalent, as a comparison... (16 / 90) x 100 = 17.8%