add difference tables for FACES Kit

docs/en/core/face_kit.md

@@ -50,3 +50,11 @@ Burn the following example(example function: M5Core and serial terminal will pri
 <figure>
     <img src="assets/img/product_pics/core/faces_kit/charger.png">
 </figure>
+
+### NOTE
+
+*The [Gray version](zh_CN/core/gray) core is configured in the FACES Kit, and our Core has several versions. Similarly, other versions of Core can be stacked on the base of the FACES. The following picture is a comparison of their main differences, which is convenient for you to use. If you want the detailed defference with them, please click [here](https://github.com/m5stack/M5-Schematic/blob/master/Core/hardware_difference_between_cores.md).*
+
+<img src="assets/img/product_pics/core/core_comparison_04.png">
+
+<img src="assets/img/product_pics/core/core_comparison_05.png">

docs/zh_CN/api/lcd.md

@@ -1,4 +1,4 @@
-# LCD
+# LCD 屏幕
 
 *屏幕像素为 320x240，以屏幕左上角为原点 (0,0)*
 

docs/zh_CN/core/face_kit.md

@@ -59,4 +59,12 @@ M5Core和FACE底板，再加上Calculator键盘之后，烧录你的固件到M5C
 
 ### 相关链接
 
-- **[购买链接](https://item.taobao.com/item.htm?spm=a1z10.3-c.w4002-1172588106.15.686c425eRw6D4J&id=562810115476)**
+- **[购买链接](https://item.taobao.com/item.htm?spm=a1z10.3-c.w4002-1172588106.15.686c425eRw6D4J&id=562810115476)**
+
+### 注意：
+
+*FACES Kit 中配置了[灰色版本](zh_CN/core/gray)的 Core，而我们的 Core 有几个版本，同样可以将其他版本的 Core 堆叠到 FACES 的底座上用。下图是它们主要区别的比较，方便您使用。如果想查看详细的资源对比，请点击[这里](https://github.com/m5stack/M5-Schematic/blob/master/Core/hardware_difference_between_cores_zh_CN.md)。*
+
+<img src="assets/img/product_pics/core/core_comparison_04_zh_CN.png">
+
+<img src="assets/img/product_pics/core/core_comparison_05_zh_CN.png">